In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

Shorten, Greens dismay gay marriage foes

Anti-gay-marriage groups have slammed comments by Labor and the Greens linking a national vote on same-sex marriage to the deadly Orlando mass shooting.

Opposition Leader Bill Shorten backed away from associating a plebiscite with gay hate crime on Saturday, after earlier making reference to the mass killing, but he said he was concerned "ugly arguments" would emerge.

But the Greens say there's "no question" the murder of 49 people at a gay nightclub proved hateful views persisted in the community.

Greens leader Richard Di Natale used "vile" online comments in response to the Orlando attack as evidence those attitudes were shared by some Australians.

"A plebiscite will unleash those voices of hate in the community," he told reporters in Sydney on Saturday.

"And we give those views legitimacy by endorsing a plebiscite."

It's a view the Greens had held consistently since the national vote was announced, he said.